Milltimber Brae Report
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Aberdeen Western Peripheral Route Alternative Routes STAG Part 1 Assessment Milltimber Brae Route Proposal Details Name and address of authority or organisation promoting the proposal: Scottish Executive Proposal Name Milltimber Brae Route Name of Planner AWPR Managing Agent Dual two lane carriageway Special Capital Cost £265m to £365m Road with grade separated Annual junctions forming a key Estimated Total Public Sector revenue - Proposal Description component of the Modern Funding Requirement support Transport System as identified in Present Value - the MTS STAG Part 1. of costs Scottish Executive (81%) £265m to £365m Funding sought from Aberdeen City Council (9.5%) Amount of Application (Predicted Out-turn Cost) Aberdeenshire Council (9.5%) Page 1 Aberdeen Western Peripheral Route Alternative Routes STAG Part 1 Assessment Milltimber Brae Route Background Information Aberdeen is the urban centre of North-East Scotland. The existing trunk road network runs through Aberdeen, with the local road network entering the city radially. The existing highway infrastructure in many areas is significantly constrained, with the trunk road bridge across the River Dee being unable to accommodate heavy goods vehicles and the trunk road through Aberdeen having a number of traffic signal controlled junctions and at grade roundabouts. In addition, over much of its length the trunk road is on a steep vertical alignment and is closely bounded by a mix of Geographic Context residential, leisure and commercial premises. These various constraints result in diversion by drivers onto local roads, causing further congestion across the network. The study area straddles the Aberdeenshire/Aberdeen City Council boundary and comprises primarily of Aberdeen’s rural hinterland although it passes close to or through several built up areas within the city boundaries. The study area crosses the River Dee Special Area of Conservation and River Don (District Wildlife Site). The study area passes close to Aberdeen Airport and crosses the Aberdeen to Inverness railway line. The study area comprises farmland and urban areas which are primarily industrial or residential. The radial routes which the study area crosses are primarily commuter routes connecting the urban areas to the west of the city centre Social Context and west of Aberdeen with the city. The main trunk roads are the A90 which runs from north to south and the A96 which heads west. Congestion within Aberdeen has become of increasing concern, in terms of both environmental impacts associated with congested traffic and with the economic impact on areas north of Aberdeen. Economic activity within the study area is primarily agricultural. There are industrial estates at Tullos and Altens in the south, Westhill and Kirkhill on the Economic Context western fringes and Bridge of Don and Blackdog in the north. Aberdeen Airport is located adjacent to Kirkhill Industrial Estate at Dyce in the west of the city. In built up areas, the main economic activity is that associated with residential areas, such as shops, restaurants and hotels. Economic activity is adversely affected due to complex journeys and increasing and unreliable journey times through the city. This affects both Aberdeen City and Aberdeenshire. Page 2 Aberdeen Western Peripheral Route Alternative Routes STAG Part 1 Assessment Milltimber Brae Route Planning Objectives Objective Performance against planning objective The planning objectives are detailed in the MTS and WPR STAG Part 1 Assessments. The AWPR objectives are grouped into the five Government Objectives and are detailed at the end of this Assessment Summary. These objectives are grouped into three categories below for assessment as planning objectives. Acceptability and Participation Public consultation was held in March/April 2005. The results of the consultation (Objective AP1) are contained in a separate public consultation report. Deliverability Refer to the Implementability Appraisal and Government Objectives for Transport (Objective D1) in this STAG Assessment. Reduce Congestion The Milltimber Brae Route attracts good traffic flows but less than the Pitfodels (Objectives EV3, EV4, EA4, IT3, IT4, IT5, AB4) and Murtle options. Being located further westwards of the city, it is not as good at providing relief to the city as the Murtle and Pitfodels options. Improve Economic Activity The route provides a longer connection between proposed rail freight transfer (Objectives EA3, EA4, IL3, IL4, IP2) depots, industrial estates and businesses, Park and Ride car parks, road and air links, than the Murtle and Pitfodels options, with a lower reduction in journey times and costs. This makes the route less attractive and is highlighted in the lower volumes of traffic using the route. Although the route will facilitate the reallocation of road space to more appropriate priority forms of transport and integration with other public transport measures proposed in the MTS, the residual volume of traffic on the existing roads is generally greater than with the Murtle and Pitfodels options. The route provides an attractive link from residential areas on the periphery of Aberdeen and Aberdeenshire to the industrial estates and main employment areas on the periphery of Aberdeen and Aberdeenshire, reducing the need to travel through the city centre, albeit less attractive than the Murtle and Pitfodels options. Enhance Safety A consistent, high quality route is provided with high capacity junctions to (SA2, SA3) maximise user safety. There is a reduction in traffic levels on the existing road networks thereby reducing the risk of accidents, although this is not as great as with the Murtle and Pitfodels options Rationale for selection or rejection of proposal Page 3 Aberdeen Western Peripheral Route Alternative Routes STAG Part 1 Assessment Milltimber Brae Route Implementability Appraisal The scheme length and earthworks information are provided for the entire route. The other information is provided for the Southern and Western Section where options are being considered. Scheme Length 33.2km Junctions (Southern Section) All directions at Charleston All directions at A93 All directions at A944 Local Routes Passes above B9077, above former Deeside Railway Line and below A93, and above A944. Earthworks Likely import of 1,545,745m3 of acceptable material required. Embankments at Hare Moss (c.15m), Craigingles Wood (c.15m), Milltimber Brae (c.15m), Foggieton (c15m) and North Technical Westfield (c.30m). Excavation expected at Hill of Blairs (c.20m), Hill of Milltimber (c.17m), Upper Beanshill (c.25m) and Craiglug (c.15m). The main technical/financial risk associated with this route is related to earthworks costs as no ground investigation information is available for the section between Banchory Devenick and Countesswells. It is estimated that approximately 3,400,000m3 of landscape fill requires to be disposed of or reused within the works. Structures Viaduct crossing of River Dee, of total length approximately 310m with main span of approximately 110m. Crossing is approximately 16m above flood plain level. Former Deeside Railway maintained by underpass (c.95m). The key technical challenge will be the design and construction of the River Dee crossing in order to avoid impact on the River Dee SAC. No temporary or permanent supports are permitted within the SAC boundary. The route is a reasonably conventional greenfield route interfacing with key existing roads at junctions and other roads with access maintained over or under the route, where possible, with bridges. Few departures from standard are anticipated although there are likely to be steep gradients approaching the A93 from the north. There is a risk relating to programme as the route has not been developed to the same level as the Murtle Route. It is Page 4 Aberdeen Western Peripheral Route Alternative Routes STAG Part 1 Assessment Milltimber Brae Route Implementability Appraisal anticipated that this will add at least one year to the programme with the earliest completion date being 2011. Any delay beyond this date will affect the scheme cost estimate due to additional construction inflation. Operation of the route will be undertaken through the Scottish Executive term contract for management of the trunk Operational road network or by a PPP concession company. The scheme is likely to be procured as a Design and Build or Public Private Partnership (eg DBFO) project. Funding of the capital costs will be split between the funding partners Scottish Executive (81%), Aberdeen City Council (9.5%) Financial and Aberdeenshire Council (9.5%). The route will be maintained through the Scottish Executive term contract for management of the trunk road network or by a PPP concession company. Public consultation was held in March/April 2005. The results of the consultation are contained in a separate public Public consultation report. Page 5 Aberdeen Western Peripheral Route Alternative Routes STAG Part 1 Assessment Milltimber Brae Route Government’s Objectives for Transport The AWPR objectives are detailed overleaf. These are also the objectives referred to in the Planning Objectives Assessment. Please note that the environmental assessment covers the southern and western corridors only, except for property counts which relate to the entire scheme. The environmental assessment is split into categories included in DMRB Volume 11. In addition, separate assessments describing the cumulative impacts on the River Dee SAC and a general assessment of impacts on special